Fix crash if OMPI_MCA_io is not set in environment.

fmihpc / vlasiator

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Fix crash if OMPI_MCA_io is not set in environment. #984

Closed ursg closed 3 months ago

ursg commented 4 months ago

geteniv returned a null pointer in this case, which caused std::string to throw an exception. (This probably broke Vlasiator in all other MPI implementations apart from openmpi)